Check this fantastic blog post:
http://www.ethanhein.com/wp/2011/visualizing-music/
There is also some great material on this book:
http://www.amazon.com/gp/aw/d/0060926716/ref=aw_d_detail?pd=1
The author also has a website with some examples.
http://www.constructingtheuniverse.com/Amen%20Break%20and%20GR.html
Happy visualizing
